You can take a look at the ESP32 pinout guide to see the features of these pins.Īll these GPIOs are RTC and support ADC: GPIOs 2, 4, 12, 13, 14, and 15. If you’re not using the microSD card, you can use these pins as regular inputs/outputs. The following pins are used to interface with the microSD card when it is on operation. To make the ESP32 run “normally”, you just need to disconnect GPIO 0 from GND.

GPIO 0 connected to GND » ESP32-CAM in flashing mode.

When GPIO 0 is connected to GND, the ESP32 goes into flashing mode and you can upload code to the board.

This GPIO is internally connected to a pull-up 10k Ohm resistor. GPIO 0 determines whether the ESP32 is in flashing mode or not. However, you won’t be able to open the Serial Monitor and see if everything is going well with your setup. You can use GPIO 1 and GPIO 3 to connect other peripherals like outputs or sensors after uploading the code. Learn how to upload code to the ESP32-CAM AI-Thinker.

The best way to upload code to the ESP32-CAM is using an FTDI programmer. Because the ESP32-CAM doesn’t have a built-in programmer, you need to use these pins to communicate with the board and upload code. GPIO 1 and GPIO 3 are the serial pins (TX and RX, respectively). If you want to have an output of 5V on the VCC pin, you need to unsolder that connection and solder the 5V pads. If you look closely, you should have a jumper on the 3.3V pads.

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